I have PMS installed on a Debian server. I noticed some strange requests in my UFW logs. After some investigation I discovered that Plex is making some kind of scanning requests to devices on my network every 30 seconds.
Does anyone know what this is for? Is it something I can stop/disable?
should be part of Plex auto-discovering players (plex clients) in your network.
usually this is the ports documented here:
https://support.plex.tv/articles/201543147-what-network-ports-do-i-need-to-allow-through-my-firewall/
I don’t think you can deactivate it…
PMS broadcasts SSDP packet sequences to discover Plex players. This is known as GDM (G’day Mate) protocol.
You can disable GDM (local network discovery) Enable local network discovery (GDM) in Settings - Server - Network but you’ll find it does complicate the server finding certain players. Plex players will always find PMS
Is there a (hidden) setting to control how often those SSDP packets are sent?
I’ve investigated UPnP traffic in my network and have seen that SSDP packets from the PMS are sent too often (for me).
Moreover, I’ve seen that SSDP packet are sent on an external (wan) interface of my computer. The packets have been blocked by firewall, but I think it’s not a good practice to send multicast packets through the wan interface. I would like to have more control on that.
